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Molded-Case Circuit Breakers & Enclosures27.0-1April 2016Molded-Case CircuitBreakers & EnclosuresSheet 27 001CA08104001EContents22Molded-Case Circuit Breakers & EnclosuresBreaker Type Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.0-2Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.0-3General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1-1Special Function Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.2-1Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3-1Circuit Breaker Selection Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.4-1Enclosed Circuit Breaker (ECB) withArcflash Reduction Maintenance System . . . . . . . . . . . . . . . . . . . . . . . 27.5-1SpecificationsSee Eaton’s Product Specification Guide, available on CD or on the Web.CSI Format: . . . . . . . . . . . . . . . . . . . . . . . . . . 19952010Molded-Case Circuit Breakers. . . . . . . . . Section 16475Section 26 28 11Electronic Trip Units . . . . . . . . . . . . . . . . . Section 16904Section 26 28 50Enclosed Circuit Breakers . . . . . . . . . . . . Section 16476Section 26 28 ded-Case Circuit BreakersFor more information, visit: www.eaton.com/consultants
27.0-2 Molded-Case Circuit Breakers & EnclosuresBreaker Type ComparisonApril 2016Sheet 27 0022223242526Summary of Differences Between Low Voltage Power Circuit Breakers,Insulated-Case Circuit Breakers and Molded-Case Circuit BreakersThere are two main classifications of low voltage circuitbreakers—molded-case circuit breakers and low voltagepower circuit breakers. All UL , NEMA and ANSI standardsare for molded-case circuit breakers and low voltagepower circuit breakers.The industry recognizes three types of circuit breakers—molded-case circuit breakers (MCCB), insulated-case circuitbreakers (ICCB) and low voltage power circuit breakersLVPCB). Insulated-case circuit breakers are designed tomeet the standards for molded-case circuit breakers.Low voltage power circuit breakers comply with thefollowing standards: ANSI Std. C37.16—Preferred RatingsANSI Std. C37.17—Trip Devices for LVPCB ANSI Std. C37.50—Test Procedures IEEE Std. C37.13—LVPCB Used in Enclosures UL 1066—LVPCB Molded-case circuit breakers and insulated-case circuitbreakers typically comply with the following standards: UL 489—MCCBUL 489—Molded-Case Switches (MCS) NEMA AB1—MCCB and MCS NEMA AB3—MCCB Application27 28Table 27.0-1. Breaker Type Comparison Chart29DescriptionLVPCB(Type Magnum DS and Series NRX )ICCB(Type Magnum SB and Series NRX)MCCB(QUICKLAG/Series C /Series G )30Select tripshort-time ratingSelective trip over full range of faultcurrents up to interrupting rating(high short-time ratings)31Selective trip over partial range of faultcurrents within the interrupting rating(medium short-time ratings). Typicallyup to 35 kASelective trip over a smaller range of faultcurrents within the interrupting rating (lowshort-time ratings). Typically 10–13 timesthe frame sizeOperator typeTypes of operators: mechanicallyoperated and electrically operatedtwo-step stored energyTypes of operators: mechanically operatedover-center toggle or motor operator32Types of operators: mechanicallyoperated and electrically operatedtwo-step stored energyClosing speed5-cycle closing for electricallyoperated devices5-cycle closing for electricallyoperated devicesGreater than 5-cycle closing for electricallyoperated devicesMountingAvailable in drawout constructionpermitting racking to a distinct “testposition” and removal for maintenanceAvailable in drawout constructionpermitting racking to a distinct “testposition” and removal for maintenanceTypically fixed-mounted but large framesizes may be available in drawoutconstructionInterrupting ratingInterrupting duty at 635 Vac:42–100 kA and current limiting withor without fuses up to 200 kAInterrupting duty at 508 Vac:35–150 kAInterrupting duty at 480 Vac:22–100 kA without fuses and upto 200 kA with integral fuses or forcurrent-limiting typeCurrent limitingSpecial current limiting types availablewith or without fuses up to 200 kASpecial current limiting types availablewithout fuses up to 150 kACurrent limiting available with and withoutfuses up to 200 kARelative costHigherMediumLowAvailableframe sizesSmall number of frame sizes available.Typical 800–6000 ASmall number of frame sizes available.Typical 800–6000 ALarge number of frame sizes available.Typical 100–2500 AMaintenanceExtensive maintenance possible on allframe sizesLimited maintenance possible on largerframe sizesVery limited maintenance possible on largerframe sizesEnclosure typesUsed in enclosures, MCCs, switchboardsand switchgearUsed in enclosures, MCCsand switchboardsUsed in enclosures, panelboards,switchboards, MCCs and control panelsSeries ratingsNot available in series ratingsNot available in series ratingsAvailable in series ratingsEnclosed rating100% continuous current rated inits enclosure80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosure80% continuous-current rated, unlessspecifically stated to be rated 100% inan enclosureStandardsANSI/IEEE C37UL 1066NEMA AB1/AB3UL 489 or UL 1066NEMA AB1/AB3UL 4893334353637383940414243For more information, visit: www.eaton.com/consultantsCA08104001E
April 2016Molded-Case Circuit Breakers & EnclosuresMolded-Case Circuit Breakers27.0-3Sheet 27 003Molded-Case Circuit Breakers222324252627Series GTable of Contents28General DescriptionCircuit Breaker Components and Functions . . . . .Electronic RMS Trip Units . . . . . . . . . . . . . . . . . . . .Accessories and Modifications . . . . . . . . . . . . . . . .Special Function Circuit BreakersMolded-Case Switches . . . . . . . . . . . . . . . . . . . . . .Motor Circuit Protectors . . . . . . . . . . . . . . . . . . . . .Current Limiting Breakers . . . . . . . . . . . . . . . . . . . .100% Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . .Series Rated Breaker Combinations. . . . . . . . . . . .High Instantaneous Breakers forSelective Coordination . . . . . . . . . . . . . . . . . . . . .Earth Leakage Circuit Breakers . . . . . . . . . . . . . . . .AFCI Circuit Breakers. . . . . . . . . . . . . . . . . . . . . . . .DC Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . . . .400 Hz Breaker Application . . . . . . . . . . . . . . . . . . .HID Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . . .Lighting Control Solenoid Operated Breakers . . .SWD Rated Breakers . . . . . . . . . . . . . . . . . . . . . . . .HACR Rated Breakers . . . . . . . . . . . . . . . . . . . . . . .Engine Generator Circuit Breakers. . . . . . . . . . . . .Mining Circuit Breakers. . . . . . . . . . . . . . . . . . . . . .Naval/Marine Rated Breakers . . . . . . . . . . . . . . . . .Welding Circuit Breakers. . . . . . . . . . . . . . . . . . . . .Application DataContinuous Ampere Rating. . . . . . . . . . . . . . . . . . .Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Interrupting Ratings . . . . . . . . . . . . . . . . . . . . . . . . .Circuit Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . .Number of Poles . . . . . . . . . . . . . . . . . . . . . . . . . . .Ground Fault Protection . . . . . . . . . . . . . . . . . . . . .Code Considerations . . . . . . . . . . . . . . . . . . . . . . . .Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Feeder Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .Branch Circuits . . . . . . . . . . . . . . . . . . . . . . . . . .Circuit Breakers Not hp Rated . . . . . . . . . . . . . .Motor Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . .Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . .Slash Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cable Sizing/Selection . . . . . . . . . . . . . . . . . . . e Current Curve Characteristics . . . . . . . . . . . .Selective Coordination . . . . . . . . . . . . . . . . . . . . . .Breaker Selection Table—100% Selective . . . .Breaker Selection Table—0.1 Sec Selective . .Arc Flash. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Arcflash Reduction Maintenance System . . . . . . .Unusual Environmental Conditions. . . . . . . . . . . .Reverse-Feed Applications . . . . . . . . . . . . . . . . . . .Circuit Breaker Selection DataOverview Tables . . . . . . . . . . . . . . . . . . . . . . . . . . .QUICKLAG Industrial Circuit Breakers . . . . . .Series G Industrial Circuit Breakers . . . . . . . . .Series C Industrial Circuit Breakers . . . . . . . . .Current Limiting Industrial Circuit Breakers. . .Industrial Circuit Breakers in Assemblies. . . . .Electronic Trip Units . . . . . . . . . . . . . . . . . . . . . .Digitrip OPTIM . . . . . . . . . . . . . . . . . . . . . . . . . .Individual Circuit Breaker Selection Data . . . . . . .QUICKLAG Industrial Circuit Breakers . . . . . . .QUICKLAG Solenoid-OperatedCircuit Breakers . . . . . . . . . . . . . . . . . . . . . . . .Series G Industrial Circuit Breakers . . . . . . . . .Series C Industrial Circuit Breakers . . . . . . . . .Series G Breaker Accessories . . . . . . . . . . . . . .Series C Breaker Accessories . . . . . . . . . . . . . .High Instantaneous Circuit Breakerfor Selective Coordination . . . . . . . . . . . . . . .Motor Circuit Protectors (MCP) . . . . . . . . . . . . .Motor Protector Circuit Breaker (MPCB) . . . . .Power Monitoring and MeteringModule (PM3). . . . . . . . . . . . . . . . . . . . . . . . . .Earth Leakage Circuit Breakers . . . . . . . . . . . .Current Limiting Modules and Breakers . . . . .Circuit Breaker Enclosures. . . . . . . . . . . . . . . . .Enclosed Circuit (ECB) with Arcflash ReductionMaintenance SystemGeneral Description. . . . . . . . . . . . . . . . . . . . . . . . .Product Description. . . . . . . . . . . . . . . . . . . . . . . . .Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Standards and Certifications . . . . . . . . . . . . . . . . .Product Selection . . . . . . . . . . . . . . . . . . . . . . . . . .Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .For more information, visit: 04127.5-127.5-127.5-127.5-127.5-227.5-327.5-34243
27.0-4 Molded-Case Circuit Breakers & EnclosuresApril 2016Sheet 27 00422This page intentionally left r more information, visit: www.eaton.com/consultantsCA08104001E
Molded-Case Circuit Breakers & EnclosuresMolded-Case Circuit BreakersApril 201627.1-1Sheet 27 005General DescriptionGeneral DescriptionGeneral CircuitBreaker InformationEaton’s molded-case circuit breakersare designed to provide circuitprotection for low voltage distributionsystems. They are described byNEMA as, “. . . a device for closingand interrupting a circuit betweenseparable contacts under both normaland abnormal conditions,” and furthermore as, “. . . a breaker assembledas an integral unit in a supportingand enclosing housing of insulatingmaterial.” The NEC describes them as,“A device designed to open and closea circuit by non-automatic means, andto open the circuit automatically on apredetermined overload of current,without injury to itself when properlyapplied within its rating.”So designed, Eaton circuit breakersprotect conductors against overloadsand conductors and connectedapparatus, such as motors andmotor starters, against short circuits.Circuit Breaker Componentsand FunctionsBeing essentially high interruptingcapacity switches with repetitiveelements, Eaton circuit breakersare comprised of three mainfunctional components. These are:1. Trip elements (thermal-magneticor electronic)2. Operating mechanism3. Arc extinguishers1. Trip ElementsThe function of the trip element is to tripthe operating mechanism in the eventof a prolonged overload or short-circuitcurrent. To accomplish this, a thermalmagnetic trip action is provided.Thermal-Magnetic BreakersEaton thermal-magnetic breakers aregeneral purpose devices suitable forthe majority of breaker applicationsand are considered the industrystandard. Available from 15–800 A,thermal-magnetic breakers provideaccurate reliable overload and shortcircuit protection for conductors andconnected apparatus.Thermal trip action is achievedthrough the use of a bimetal heated bythe load current. On a sustained overload, the bimetal will deflect, causingthe operating mechanism to trip.Because bimetals are responsive tothe heat emitted by the current flow,they allow a long-time delay on lightoverloads, yet they have a fastresponse on heavier overloads.Magnetic trip action is achieved throughthe use of an electromagnet in serieswith the load current. This provides aninstantaneous tripping action when thecurrent reaches a predetermined value.Front-adjustable magnetic trip elementsare supplied as standard on 250 A framecircuit breakers and above (except 100 Aand 150 A magnetic only breakers), allother thermal-magnetic breakers havenon-adjustable magnetic trip elements.Electronic RMS Trip BreakersEaton electronic trip breakers aregenerally applied for applicationswhere high le
Enclosure types Used in enclosures, MCCs, switchboards and switchgear Used in enclosures, MCCs and switchboards Used in enclosures, panelboards, switchboards, MCCs and control panels Series ratings Not available in series ratings Not avail able in series ratings Available in series ratings Enclosed rating 100% continuous current rated in its enclosure 80% continuous-current rated, unless .
